Thanks for all these additional information.
I understand your concern.
Well as you describe,possibly it's folliculitis/ingrown hair.
And I really assure you that it's not herpes.
As herpetic lesions are painful and appear in cluster.
You have single bump with slight itching,tenderness,redness so you should try OTC 1% hydrocortisone cream mixed with bacitracin.
And use OTC Abzorb powder after bath.
You should wear loose fitted clothes to prevent friction.
Take OTC Motrin and Claritin for 3 days.
Most likely it'll resolve.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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